日期修改Android Calendar的学习与运用【转】

查了好多资料，发现还是不全，干脆自己整理吧，至少保证在我的做法正确的，以免误导读者，也是给自己做个记录吧！

每日一道理

流逝的日子像一片片凋零的枯叶与花瓣，渐去渐远的是青春的纯情与浪漫。不记得曾有多少雨飘在胸前风响在耳畔，只知道沧桑早已漫进了我的心爬上了我的脸。当一个人与追求同行，便坎坷是伴，磨难也是伴。

import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
* Android Calendar的应用
* @author Administrator
*
*/
public class CalendarUtil {

private int weeks = 0;// 用来全局控制 上一周，本周，下一周的周数变更
private int MaxDate; // 一月最大天数
private int MaxYear; // 一年最大天数

public static void main(String[] args) {
CalendarUtil tt = new CalendarUtil();
System.out.println("获得当天日期:" + tt.getNowTime("yyyy-MM-dd"));
System.out.println("获得本周一日期:" + tt.getMondayOFWeek());
System.out.println("获得本周日的日期:" + tt.getCurrentWeekday());
System.out.println("获得上周一日期:" + tt.getPreviousWeekday());
System.out.println("获得上周日日期:" + tt.getPreviousWeekSunday());
System.out.println("获得下周一日期:" + tt.getNextMonday());
System.out.println("获得下周日日期:" + tt.getNextSunday());
System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));
System.out.println("获得本月第一天日期:" + tt.getFirstDayOfMonth());
System.out.println("获得本月最后一天日期:" + tt.getDefaultDay());
System.out.println("获得上月第一天日期:" + tt.getPreviousMonthFirst());
System.out.println("获得上月最后一天的日期:" + tt.getPreviousMonthEnd());
System.out.println("获得下月第一天日期:" + tt.getNextMonthFirst());
System.out.println("获得下月最后一天日期:" + tt.getNextMonthEnd());
System.out.println("获得今年的第一天日期:" + tt.getCurrentYearFirst());
System.out.println("获得今年最后一天日期:" + tt.getCurrentYearEnd());
System.out.println("获得去年的第一天日期:" + tt.getPreviousYearFirst());
System.out.println("获得去年的最后一天日期:" + tt.getPreviousYearEnd());
System.out.println("获得明年第一天日期:" + tt.getNextYearFirst());
System.out.println("获得明年最后一天日期:" + tt.getNextYearEnd());
System.out.println("获得本季度第一天:" + tt.getThisSeasonFirstTime(11));
System.out.println("获得本季度最后一天:" + tt.getThisSeasonFinallyTime(11));
System.out.println("获得两个日期之间间隔天数2008-12-1~2008-9.29:"
+ CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));
System.out.println("获得以后月的第几周：" + tt.getWeekOfMonth());
System.out.println("获得以后年份：" + tt.getYear());
System.out.println("获得以后月份：" + tt.getMonth());
System.out.println("获得今天在今年的第几天：" + tt.getDayOfYear());
System.out.println("获得今天在本月的第几天(获得以后日)：" + tt.getDayOfMonth());
System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek());
System.out.println("获得半年后的日期："
+ tt.convertDateToString(tt.getTimeYearNext()));
}

public static int getYear() {
return Calendar.getInstance().get(Calendar.YEAR);
}

public static int getMonth() {
return Calendar.getInstance().get(Calendar.MONTH) + 1;
}

public static int getDayOfYear() {
return Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
}

public static int getDayOfMonth() {
return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
}

public static int getDayOfWeek() {
return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
}

public static int getWeekOfMonth() {
return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);
}

public static Date getTimeYearNext() {
Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);
return Calendar.getInstance().getTime();
}

public static String convertDateToString(Date dateTime) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
return df.format(dateTime);
}

public static String getTwoDay(String sj1, String sj2) {
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try {
java.util.Date date = myFormatter.parse(sj1);
java.util.Date mydate = myFormatter.parse(sj2);
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
return "";
}
return day + "";
}

public static String getWeek(String sdate) {
// 再转换为时光
Date date = CalendarUtil.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour中存的就是星期几了，其范围 1~7
// 1=日曜日 7=星期六，其他类推
return new SimpleDateFormat("EEEE").format(c.getTime());
}

public static Date strToDate(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}

public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals(""))
return 0;
if (date2 == null || date2.equals(""))
return 0;
// 转换为标准时光
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date = null;
java.util.Date mydate = null;
try {
date = myFormatter.parse(date1);
mydate = myFormatter.parse(date2);
} catch (Exception e) {
}
long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
return day;
}

public String getDefaultDay() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 设为以后月的1号
lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号
lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天

str = sdf.format(lastDate.getTime());
return str;
}

public String getPreviousMonthFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 设为以后月的1号
lastDate.add(Calendar.MONTH, -1);// 减一个月，变为下月的1号
// lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天

str = sdf.format(lastDate.getTime());
return str;
}

public String getFirstDayOfMonth() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 设为以后月的1号
str = sdf.format(lastDate.getTime());
return str;
}

public String getCurrentWeekday() {
weeks = 0;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);
Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getNowTime(String dateformat) {
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式
String hehe = dateFormat.format(now);
return hehe;
}

private int getMondayPlus() {
Calendar cd = Calendar.getInstance();
// 获得今天是一周的第几天，日曜日是第一天，星期二是第二天......
int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1
if (dayOfWeek == 1) {
return 0;
} else {
return 1 - dayOfWeek;
}
}

public String getMondayOFWeek() {
weeks = 0;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus);
Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getSaturday() {
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getPreviousWeekSunday() {
weeks = 0;
weeks--;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getPreviousWeekday() {
weeks--;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getNextMonday() {
weeks++;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

public String getNextSunday() {

int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}

private int getMonthPlus() {
Calendar cd = Calendar.getInstance();
int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
cd.set(Calendar.DATE, 1);// 把日期设置为当月第一天
cd.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天
MaxDate = cd.get(Calendar.DATE);
if (monthOfNumber == 1) {
return -MaxDate;
} else {
return 1 - monthOfNumber;
}
}

public String getPreviousMonthEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, -1);// 减一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
str = sdf.format(lastDate.getTime());
return str;
}

public String getNextMonthFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);// 减一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
str = sdf.format(lastDate.getTime());
return str;
}

public String getNextMonthEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);// 加一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
str = sdf.format(lastDate.getTime());
return str;
}

public String getNextYearEnd() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);// 加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
lastDate.roll(Calendar.DAY_OF_YEAR, -1);
str = sdf.format(lastDate.getTime());
return str;
}

public String getNextYearFirst() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);// 加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
str = sdf.format(lastDate.getTime());
return str;

}

private int getMaxYear() {
Calendar cd = Calendar.getInstance();
cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为昔时第一天
cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
return MaxYear;
}

private int getYearPlus() {
Calendar cd = Calendar.getInstance();
int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 获得当天是一年中的第几天
cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为昔时第一天
cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
if (yearOfNumber == 1) {
return -MaxYear;
} else {
return 1 - yearOfNumber;
}
}

public String getCurrentYearFirst() {
int yearPlus = this.getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, yearPlus);
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
return preYearDay;
}

// 获得今年最后一天的日期 *
public String getCurrentYearEnd() {
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years = dateFormat.format(date);
return years + "-12-31";
}

// 获得上年第一天的日期 *
public String getPreviousYearFirst() {
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);
years_value--;
return years_value + "-1-1";
}

// 获得上年最后一天的日期
public String getPreviousYearEnd() {
weeks--;
int yearPlus = this.getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks
+ (MaxYear - 1));
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
return preYearDay;
}

public String getThisSeasonFirstTime(int month) {
int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
int season = 1;
if (month >= 1 && month <= 3) {
season = 1;
}
if (month >= 4 && month <= 6) {
season = 2;
}
if (month >= 7 && month <= 9) {
season = 3;
}
if (month >= 10 && month <= 12) {
season = 4;
}
int start_month = array[season - 1][0];
int end_month = array[season - 1][2];

Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);

int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value, end_month);
String seasonDate = years_value + "-" + start_month + "-" + start_days;
return seasonDate;

}

public String getThisSeasonFinallyTime(int month) {
int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
int season = 1;
if (month >= 1 && month <= 3) {
season = 1;
}
if (month >= 4 && month <= 6) {
season = 2;
}
if (month >= 7 && month <= 9) {
season = 3;
}
if (month >= 10 && month <= 12) {
season = 4;
}
int start_month = array[season - 1][0];
int end_month = array[season - 1][2];

Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);

int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value, end_month);
String seasonDate = years_value + "-" + end_month + "-" + end_days;
return seasonDate;

}

private int getLastDayOfMonth(int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
|| month == 10 || month == 12) {
return 31;
}
if (month == 4 || month == 6 || month == 9 || month == 11) {
return 30;
}
if (month == 2) {
if (isLeapYear(year)) {
return 29;
} else {
return 28;
}
}
return 0;
}

public boolean isLeapYear(int year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}

public boolean isLeapYear2(int year) {
return new GregorianCalendar().isLeapYear(year);
}
}

文章结束给大家分享下程序员的一些笑话语录： 某程序员对书法十分感兴趣，退休后决定在这方面有所建树。花重金购买了上等的文房四宝。一日突生雅兴，一番磨墨拟纸，并点上了上好的檀香，颇有王羲之风 范，又具颜真卿气势，定神片刻，泼墨挥毫，郑重地写下一行字：hello world.

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